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The only type that seems even remotely possible / reasonable is Sound, because it already exists as a unique element with its own unique battle traits in game, but comes with two major problems:
1. Completely fucks over Special-based Normal types, because the only Special moves they would have left would be:
>Hyper Beam (recharge move)
>Razor Wind (charge move)
>Sonic Boom (it does fucking 20 damage)
>Spit Up (needs Stockpile to work)
>Swift
>Tri Attack
>Trump Card (gimmick move with poor distribution)
>the default versions of Judgement, Techno Blast (both signatures), Tera Blast (getting wiped after this gen) and Terrain Pulse (meant to be used on terrain)
essentially leaving them with a whopping total of two actual Special attacks to use, one of which being 60 BST.
2. Overlaps with a bunch of pre-existing Pokemon, abilities, and moves
>What happens to Sound-based moves that AREN'T Normal like Bug Buzz (ex: tons of Bug types rely on Bug Buzz for strong special STAB, which they'd immediately lose out on)? Do you just wind up with a bunch of Flying Press-esqe moves with dual types?
>What happens to pre-existing dual types that are clearly sound based? Do you remove Dragon or Fighting from Kommo-O? Dragon or Flying from Noivern? Electric or Poison from Toxtricity? Water or Fairy from Primarina? Fire or Ghost from Skeledirge? Etc.
>Does Liquid Voice just become Water-type Aerilate for Sound-type moves? Does Punk Rock become like Steelworker? What happens if Primarina / Toxtricity get type changes that conflict with these?
It seems like a whole lot harder of a situation than Fairy was. Most other common fan types can just be grouped into pre-existing types (Cosmic -> Psychic, Food & Light -> Fairy, Wind -> Flying, Technology -> Steel)